Surface modified electric insulation system

FIELD: electricity.

SUBSTANCE: surface modified electric insulation system used for electric insulation of an external plant, which makes it possible for garbage and contaminants deposited on the surface to be removed by rain, i.e. self-cleaned, has a superhydrophobic surface containing a composition of a hardened or a cured synthetic polymer, which contains at least one filler and other additives, if required, in which at least one filler is selected from the group containing inorganic oxides, inorganic hydroxides and inorganic metahydroxides, and the surface of the electric insulation system represents a structured surface with its micro- and nano-size characteristics, besides, the specified surface is coated with a liquid hydrophobic compound; a method is also described how to manufacture an electric insulation system.

EFFECT: production of highly resistant and durable electric insulation.

31 cl

 

The technical field to which the invention relates.

The invention relates to surface modified electrical insulation system comprising the composition of a synthetic polymer containing the selected filler, the surface of the specified insulating system is overhydrate. Also the present invention relates to a method for producing a surface modified electrical insulation system having overhydrating surface.

The level of technology

For electrical insulation for outdoor installation usually requires that such electrical insulation had a hydrophobic surface, which allows debris and contaminants deposited on the surface were removed by rain, which leads to purification. Such self-cleaning surfaces are produced, for example, of silicone rubber or compositions of hydrophobic cycloaliphatic epoxy resins. These materials are classified as hydrophobic due to the fact that they have a surface contact angle with water in the range of 90-140°. The efficiency of purification can be increased by increasing the surface contact angle with water above 140°. Surface, with a surface contact angle with water above 140°, usually refers to overhydrate surfaces. It is known that such high the surface wetting angles achieved by the application of insulating coating material with the so-called Lotus effect. To get overhydrating surface, the outermost surface should be hydrophobic, and it is preferable that this layer was structured in micro - or nano-range thickness.

Document WO 2006/044642 discloses a method of using the Lotus effect as overhydrating protective coating systems for outdoor electrical insulation. Submitted material with Lotus effect forms a secondary coating as an additional layer on the substrate material, resulting in the substrate material does not affect the surface properties provided by the secondary coating material. A significant disadvantage of using secondary coating is that the durability of the coating material often depends on the degree of adhesion of the coating to the substrate. Another disadvantage is that the properties of the coating, for example, dielectric properties and resistance to UV radiation, will inevitably differ from those properties of the substrate. To solve this problem, WO 2006/044642 proposes to add UV stabilizers and flame retardants in the material with the Lotus effect.

Disclosure of inventions

It is now established that it is possible to obtain a surface of an electrical insulator, which shows the Lotus effect and at the same time possesses the same properties, for example,dielectric properties and resistance to ultraviolet radiation, as the substrate material of the electrical insulator. In addition, fixed the issue that caused the separate coating. In accordance with the present invention this is achieved by processing the surface of the insulator so that it turns out "structured surface of the insulator. Under the structured surface means that the surface is a native (natural) state, i.e. the surface of the insulator is present with its microscale and nanoscale features. These characteristics are required for creation on their basis of the Lotus effect in accordance with the present invention. The structured surface material of the insulator is obtained, for example, by sandblasting the surface of the substrate material. The structured surface of the insulator material is processed liquid hydrophobic compound. Such liquid hydrophobic compound can be, for example, liquid polysiloxane, which on the surface creates a thin layer of hydrophobic compounds, and in the result the surface becomes overhydrate. In addition, the liquid hydrophobic compound may be amphiphilic compound, which the structured surface of the insulator material is processed for a sufficiently long period of time is EIW, until then, until the formed surface with a self-organizing monolayer (SAM). It is also possible combined processing of the structured surface, i.e. the structured surface is processed amphiphilic compound and then a liquid hydrophobic compound, for example, liquid polysiloxane.

Processing liquid hydrophobic compound, such as liquid polysiloxane, can be performed either by processing the structured surface directly hydrophobic compound, or by introducing a hydrophobic additive in the substrate, or by combining both methods. Liquid hydrophobic material can diffuse from the inside of the composition of the insulator on the surface of the insulator and to create a thin liquid layer of hydrophobic material on the structured surface, transforming the specified surface in overhydration.

The essential feature of the present invention is that the insulator material contains an inorganic filler such as silicon dioxide or aluminum oxide, which is at least partially applied to the surface and injected into the natural shape using sandblasting.

Self-assembling monolayers (SAM) are formed from the so-called amphiphilic molecules, i.e. molecules that have different chemical properties at each the end of the molecule. Typical examples are compounds, molecules, respectively, which at one end are hydrophobic, i.e. they are hydrophobic due to the presence of hydrophobic end group, and at the other end is hydrophilic due to the presence of affinity to water on the other end. When using self-organizing monolayer (SAM) surface, such surface properties such as surface energy, can change, and in this regard, the hydrophilic surface can be converted to a hydrophobic surface.

The implementation of the invention

The present invention is defined by the claims. The present invention relates to surface modified electrical insulation system with overhydration surface, and the insulation system contains the composition of the hardened or cured synthetic polymer, which contains at least one filler, and optionally, additional additives, characterized in that:

(i) the specified synthetic polymer selected from electrically insulating thermoplastic and thermosetting polymers;

(ii) at least one filler selected from the group consisting of inorganic oxides, inorganic hydroxides and inorganic Metagalaxy;

(iii) at least one filler is constituted which helps in insulating the system number in the range of about 60-80 wt.%, calculated with respect to the total weight of the electrical system; and

(iv) the surface of the insulating system is in the form of a structured surface with its micro - and nanoscale characteristics, and specified the structured surface is covered with a liquid hydrophobic compound.

Specified liquid hydrophobic compound, which is coated or treated with the structured surface of the insulating system, respectively, which covers the structured surface of the insulating system, preferably selected from liquid organopolysiloxanes, and preferably of circular organopolysiloxanes and/or oligomeric organopolysiloxanes low molecular weight. In addition, this structured surface coated with a liquid hydrophobic compound can be covered with self-organising there are a monolayer (SAM)consisting of at least one amphiphilic compound, and specified a self-organized monolayer (SAM) may optionally be further coated with a liquid hydrophobic compound.

The present invention also relates to a method for producing a surface modified electrical insulation system having overhydrating surface. Still present invention relates to the use of the specified surface is surface modified electrical insulation system as insulating systems in electrical equipment. In addition, the present invention relates to electric products containing specified surface modified electrical insulation system.

Surface modified electrical insulation system in accordance with the present invention contains the composition is hardened or cured synthetic polymer. The specified polymer may be selected from polymers known in the art and used in insulating compositions, such as polyesters, e.g. poly(methyl-methacrylate) or poly(alkylacrylate), or thermosetting polymers, such as polyurethanes or compositions of epoxy resins. Preferred are compositions of epoxy resins, particularly cycloaliphatic compositions of epoxy resins. These compositions of epoxy resins usually contain epoxy resin, hardener, curing agent to accelerate the curing process, as well as other additives. These compounds are known in themselves.

Cycloaromatization and cycloaliphatic compounds based on epoxy resins may be used within the scope of the present invention. Preferred are cycloaliphatic compounds based on epoxy resin. Such compounds based on epoxy resins contain at least two 1,2-epoxy groups in the molecule. Used this the future of invention compounds based on epoxy resins contain unsubstituted Picadilly group and/or Picadilly group, substituted with methyl groups. These Picadilly compounds are epoxy number (equivalent/kg), preferably at least three, preferably at least four, and especially preferably about five and above, preferably from 5.0 to 6.1. Preferred are, for example, optionally substituted epoxy resin of the formula (I):

where D=O, SO2-, -CO-, -CH2-, -C(CH3)2-, -C(CF3)2-,

n=0 or 1.

Compounds according to formula (1)in which D represents -(CH2)or [-C(CH3)2-], are preferred. Other cycloaliphatic epoxy resins for use within the scope of the present invention, moreover, are, for example, bis-glycidyloxy esters hexa-hydro-about-ftalievogo acid, bis-glycidyloxy esters hexa-hydro-m-ftalievogo acid or bis-glycidyloxy esters hexa-hydro-p-ftalievogo acid. Preferred cycloaliphatic compounds based on epoxy resins are liquid at room temperature or when heated to a temperature of 65°C. the Preferred cycloaliphatic compound based on epoxy resin is, for example, diglycidyl ether Araldite® CY 184 (Huntsman Advanced Materials Ltd.), with the content of epoxy groups 5,80-6,10 (equiv/kg), or Araldite® CY 5622 (Huntsman Advanced Matrials Ltd.), moreover, the modified compound based on epoxy resin has a content of epoxy groups 5,80-6,10 (equiv./kg). Araldite® CY 5622 composition is hydrophobic cycloaliphatic resins to impart hydrophobicity and use in compositions based on epoxy resins when applied externally. The composition of the hydrophobic cycloaliphatic resin means that the filler is treated with silane or silane composition includes additives.

Composition of epoxy resin to be cured, usually contains epoxy resin, curing agent and curing agent. Hardeners are, for example, hydroxyl and/or carboxyl-containing polymers, such as polyester containing end carboxyl group and/or carboxylate polymers based on acrylates or methacrylates and/or anhydrite carboxylic acid. Used curing agents are aliphatic, cycloaliphatic polycarbonate acid. The preferred anhydrides are liquid cycloaliphatic anhydrides with a viscosity at 25°C., about 70 to 80 MPa·S. This liquid hardener based on cycloaliphatic anhydride is, for example, Aradur® HY 1235 (Huntsman Advanced Materials Ltd.). Select the hardener may be used in concentrations in the range from 0.2 to 1.2 equivalents of the present curing groups, for example, one anhydrite group 1 epoxy is th equivalent.

The inorganic filler has a mean particle size which is typically used in electrical insulation systems, typically in the range of 1 micron (μm) to 3 mm is Preferred average particle size in the range from about 5 μm to 300 μm, preferably from 10 μm to 100 μm or selected combinations of particles with an average size. It is preferable filler with a high surface area.

The filler is selected from those fillers that have a structured surface after sandblasting. Discovered that such structured surface has a surprisingly high bond strength with a liquid hydrophobic compound. The structured surface is also capable of chemical reaction with the hydrophilic end of amphiphilic molecules so that the formed self-organized monolayers (SAM). To achieve this effect, the mineral filler is preferably chosen from the group consisting of inorganic oxides, inorganic hydroxides and inorganic Metagalaxy, preferably silicon dioxide, quartz, known silicates, aluminum oxide, aluminum trihydrate [ATH] and titanium oxide. Preferred are silicon dioxide, quartz, alumina, aluminum trihydrate [ATH], of which the preferred silicon dioxide, aluminum oxide and rigid is at aluminum [ATH] and of these, the preferred silicon dioxide. These fillers in each case have a minimum content of SiO2or, respectively, the minimum content of Al2About3about 95-98 wt.%, preferably 96 to 98 wt.%.

The inorganic filler is present in the composition of the synthetic polymer in the range from about 60 wt.% to about 80 wt.%, preferably in the range of 60-70 wt.% and preferably about 65 wt.%, the calculated relative to the total weight of the composition of the synthetic polymer.

The surface of the insulating system is a structured surface in its natural state with its micro - and nanoscale features. Such structured surface can be fabricated by sandblasting the surface of the insulation until then, until you have received all the micro - and nanoscale features.

In accordance with a variant implementation of the present invention the surface of the insulating system, which is present in the form of a structured surface covered with a liquid hydrophobic compound. Such liquid hydrophobic compound is preferably selected from liquid organopolysiloxanes, preferably of circular organopolysiloxane and/or low molecular weight oligomeric organopolysiloxane.

Liquid hydrophobic compound in the form of tsiklicheskogo is ogrenebiliyorsunuz consists of units of the chemical formula[Si(R)(R)O]-, which form a ring, preferably consisting of 4-12 such links. Usually this cyclical organopolysiloxane is a mixture of such cyclic compounds, which are known to specialists in this field of technology. Preferred are cyclic organopolysiloxane from 4 to 8 such organosiloxanes links. The substituents R in the formula[Si(R)(R)O]- independently from each other represent a linear, branched or cyclic alkyl or phenyl, and Akilova group has preferably from 1 to 8 carbon atoms and optionally substituted by chlorine and/or fluorine; preferably phenyl, (C1-C4)-alkyl, which may be replaced by fluorine; preferably phenyl, 3,3,3-trifloromethyl, monitoronly, deformity, trifluromethyl or unsubstituted (C1-C2)-alkyl; preferably methyl.

Liquid hydrophobic compound in the form of low molecular weight oligomeric organopolysiloxane consists of links with the chemical formula[Si(R)(R)O]-, which end with end groups of the formula-OSi(R)3-, in which R represents the same as the substituent R in the cyclic polysiloxane compounds mentioned above. Low molecular weight liquid oligomeric organopolysiloxane are usually a mixture of such compounds, and may contain up to 50 parts -[Si(R(R)O]-, preferably from 8 to 20 such units. It is known to specialists in this field of technology.

Liquid hydrophobic compound may be added to the structured surface by itself without solvent or dissolved in an appropriate solvent, such as any organic solvent, preferably an aliphatic hydrocarbon with a low boiling point, and be applied to the structured surface of the insulating system due to the fact that the solvent then evaporates. Liquid hydrophobic compound is applied in such a quantity that is formed in a layer thickness within nano - or micro.

Preferably, the liquid hydrophobic compound was introduced into the insulating system. Liquid hydrophobic compound can then diffuse from the inside of the system to the structured surface of the insulator, forming overhydrating surface, and also to restore water repellency. In this case, it is recommended that separate the introduction of hydrophobic compounds on the surface, but it is absolutely not necessary. The amount of liquid polysiloxane compounds when introduced into the insulating system is in the range preferably from 0.1 wt.% up to 5 wt.%, preferably from 0.5 wt.% up to 5 wt.% and especially about 1 wt.%, calculated in respect of which the current weight of the composition of the insulator.

A preferred variant of the invention is that a liquid hydrophobic compound is introduced into the insulating system. The surface of the insulator is then subjected to a sandblasting treatment for the formation of the structured surface. On the specified structured surface of the insulating system is then applied in liquid hydrophobic compound so that the surface becomes covered with a thin layer of the specified liquid hydrophobic compound.

Another preferred variant of the invention is that a liquid hydrophobic compound is introduced into the insulating system. Then the surface of the insulator is exposed sandblasted to obtain a structured surface. Specified the structured surface of the insulating system is then covered with a self-organizing monolayer (SAM)consisting of at least one amphiphilic compounds as described above. If necessary, the liquid hydrophobic compound is then applied to the surface of the insulating system, which was pre-applied self-organizing monolayer.

Therefore, the structured surface of the insulating system can either be coated with a liquid hydrophobic compound, or be covered by a self-organizing monolayer (SA), consisting of at least one amphiphilic compounds, or to be covered by the self-organizing monolayer together with a liquid hydrophobic compound. Self-organizing monolayers have a thickness in the range of nano - and micro-range, which is known and specified thin layer is electroconductive.

Self-assembling monolayers (SAM) are created either from solution or from the gaseous phase. Reactive group of the amphiphilic compound chemically reacts with structured surface material of the insulator, thereby forming a self-organized monolayer. In accordance with the present invention are preferred self-organizing monolayers of silane-based, derived from allyltrichlorosilane. Preferred are self-organized monolayers obtained from (C4-C22) - allyltrichlorosilane, preferably from (C12-C22)-allyltrichlorosilane, for example, from octadecyltrichlorosilane (OTS). These silanes are chemically associated with gidroksilirovanii surfaces so that gidrauxilirovannaya silicon dioxide (SiO2or compositions based on epoxy resins having free reactive groups such as hydroxyl group, by removal of the chlorine atoms and the formation of links Si-O-Si, which lead to images is of a self-organized monolayer, which overhydration.

If self-organizing monolayer is formed from a solution, there can be used various solutions-media. The preferred solutions-media mentioned trichlorosilanes are usually anhydrous organic solvents, such as benzene, toluene, bicyclohexyl, 2,2,4-trimethylpentane or similar solvents.

If self-organizing monolayer is formed from the gaseous phase, i.e. chemical deposition from the gas phase, the surface to be processed is placed, for example, in a vacuum chamber at room temperature together with a vessel containing silane compound, for example, octadecyltrichlorosilane (OTS). Then the pressure decreases below the pressure of saturated vapor (OTS), for example, to 6.7 mbar (at room temperature). After about 24 hours the surface is completely covered, i.e. self-organizing monolayer obtained.

Necessary additives in the composition may optionally contain a curing accelerator to enhance polymerization of the epoxy resin with the hardener. Other additives can be selected from a wetting/dispersing agents, plasticizers, softeners, antioxidants, Svetozarov, pigments, flame retardant agents, fibers, and other additives commonly used in electrical devices. They are known for JV is the employees and are not critical in respect to the present invention.

The present invention also relates to a method for manufacturing surface modified electrical insulation system having overhydrating surface, and insulating system contains the composition is hardened or cured synthetic polymer, which contains at least one filler and optionally other additives, and the method comprises the following stages: (i) a composition of the hardened or cured synthetic polymer containing at least one filler and optionally other additives, as described above; (ii) processing the surface of the insulating system for forming a structured surface with its micro - and nanoscale characteristics; and (iii coverage of a specified structured surface of a liquid hydrophobic compound; or a self-organizing monolayer (SAM)consisting of at least one amphiphilic compound; or coating a given surface emergent monolayer (SAM)consisting of at least one amphiphilic compound and a liquid hydrophobic compound.

It is preferable to apply a surface modified electrical insulation system described in this invention for isolation in the transmission and distribution of energy, especially in the area of p is upitannyh electric windings and the manufacture of electrical components, as transformers, mounted contacts, insulating bushings, high-voltage insulators for indoor and outdoor use, especially for outdoor insulators connected to high-voltage lines, such as long-rod, composite and cap insulators, sensors, converters, end fitting of the cable, as well as for base insulators in the medium voltage networks, in the manufacture of insulators associated with outdoor power switches, measuring transducers, bushing sleeves, means of overvoltage protection in switchgear. The following examples illustrate the invention.

Example 1

(A) obtaining a substrate

The composition of the cycloaliphatic epoxy composition used as a material of the insulator in this example, are shown in table 1. All components except the catalyst is pre-heated to 45°C. they are Then thoroughly mixed together at ambient pressure using a propeller stirrer. Then the stirred mixture escaped in a vacuum furnace, with stirring for 20 minutes under a pressure of 5 mbar at 60°C. Then the mixture is molded in a plate thickness of 6 mm using a steel mold preheated to 90°C and covered with additive Huntsman QZ13 facilitating new the ku product from the mold. Apply a 2-hour curing cycle at 90°C, followed by 24-hour cycle at 140°C to ensure complete curing. Surface contact angle between the structured surface that is filled with silicon dioxide cycloaliphatic epoxy and water is measured after sandblasting and cleaning away any dirt and does not exceed 90°.

Table 1
ComponentsParts per 100 parts resin
Huntsman CY 184 (resin)100
Huntsman HY1235 (hardener)90
Huntsman DY062 (catalyst)0,54
Huntsman DW9134 (pigment, TiO2)2,7
Quarzwerke W12EST (filler)359

Araldite CY 184: cycloaliphatic epoxy resin (Huntsman)
Aradur® HY 1235: modified cycloaliphatic anhydride (Huntsman)
Will accelerate the ü DY062: tertiary amine
W12EST:SiO2(Quarzwerke GmbH)

(C) Sandblasting and processing octadecyltrichlorosilane

The cured insulation material based on a cycloaliphatic epoxy resin prepared in example 1, section (A), is subjected to sanding and clean up any remaining dirt. Then the structured surface is treated by immersing it in a solution of octadecyltrichlorosilane (OTS) bicyclohexyl with a concentration of 4 mmol per liter of bicyclohexyl temperature and ambient pressure in an argon atmosphere for 24 hours for the formation of self-organized monolayer, which chemically binds to exposed to the processing surface. The resulting surface has a contact angle against distilled water over 140°.

Example 2

Insulating material from utverzhdenii hydrophobic cycloaliphatic epoxy resin is prepared in the same manner as described in example 1. Then the surface is exposed sandblasted and cleaned from dirt. Then, the surface material is injected hydrophobic additive, i.e. cyclic dimethylsiloxane containing on average from 6 to 8 dimethylsiloxane links. After that, the insulation material n is grebaut up to 80°C to improve the migration of hydrophobic additives on the entire surface of the material and then cooled to room temperature. Hydrophobic additive in epoxy is also allocated on a structured surface. The resulting surface has a contact angle with distilled water over 140°. The composition of the insulation material of the hydrophobic cycloaliphatic epoxy resin are shown in table 2.

Table 2
ComponentsParts per 100 parts resin
Huntsman CY5622 (resin)100
Huntsman HY1235 (hardener)82
Huntsman DY062 (catalyst)0,54
Huntsman DW9134 (pigment Tio2)2,7
Quarzwerke W12EST (filler)344

Araldite® CY5622: Hydrophobic cycloaliphatic epoxy resin (Huntsman), containing liquid polydimethylsiloxane.

1. Surface modified electrical insulation system, comprising:
the composition is hardened or cured synthetic polymer, which contains a synthetic polymer comprising at least one electrically insulating thermoplastic polymer and electro is selecionado thermosetting polymer, and at least one filler comprising at least one inorganic oxide, an inorganic hydroxide and inorganic Metagalaxy and the quantity of at least one filler present in the insulating system is 60 wt.% up to 80 wt.% with respect to the total weight of the electrical system; and
the surface, which is formed as a structured surface with micro - and nano-dimensional features, covered with a liquid hydrophobic compound.

2. Electrical insulation system according to claim 1, in which the specified liquid hydrophobic compound, covering the structured surface of the insulating system is a liquid organopolysiloxane.

3. Electrical insulation system according to claim 1, in which the specified liquid hydrophobic compound, covering the structured surface of the insulating system, is a self-organizing monolayer (SAM)consisting of at least one amphiphilic compound.

4. Electrical insulation system according to claim 1, in which the specified liquid hydrophobic compound, covering the structured surface of the insulating system, is a self-organizing monolayer (SAM)consisting of at least one amphiphilic compound, and pointed to by the second self-organizing monolayer (SAM) is additionally covered with a liquid hydrophobic compound, which is a liquid organopolysiloxane.

5. Electrical insulation system according to claim 1, in which the synthetic polymer is selected from polymers used in electrical insulating compositions.

6. Electrical insulation system according to claim 5, in which the synthetic polymer is a composition cycloaliphatic epoxy resin.

7. Electrical insulation system according to claim 1, in which the filler is selected from materials fillers, which have a structured surface after sandblasting.

8. Electrical insulation system according to claim 7, in which the filler has a minimum content of SiO2about 95-98 wt.%.

9. Electrical insulation system according to claim 1, in which the filler is present in the composition of the synthetic polymer in the range from about 60 wt.% to about 80 wt.% calculated on the total weight of the composition of the synthetic polymer.

10. Electrical insulation system according to claim 1, in which the filler has an average particle size ranging from 1 μm to 3 mm, or the selected combination of particles with an average size.

11. Electrical insulation system according to claim 1, in which the hydrophobic liquid compound is a cyclic granpritelecom, which consists of units of the chemical formula[Si(R)(R)O]-, which form a ring, where the substituents R independently from each other mean LINEST is th, branched or cyclic alkyl or phenyl, the alkyl residue having from 1 to 8 carbon atoms, optionally substituted by chlorine and/or fluorine.

12. Electrical insulation system according to claim 11, in which each R represents a phenyl, 3,3,3-trifloromethyl, monitoronly, deformity, trifluromethyl or unsubstituted (C1-C2)-alkyl.

13. Electrical insulation system according to claim 1, in which the hydrophobic liquid compound is a low molecular weight oligomeric organopolysiloxane, which consists of units of the chemical formula[Si(R)(R)O]-, which end terminal groups of the formula-OSi(R)3-, where each R independently from each other mean a linear, branched or cyclic alkyl or phenyl, the alkyl residue having from 1 to 8 carbon atoms, optionally substituted by chlorine and/or fluorine.

14. Electrical insulation system according to claim 1, in which the hydrophobic liquid compound is introduced in the electrical insulation system in an amount of from 0.1 wt.% up to 5 wt.% calculated on the total weight of the insulating system.

15. Electrical insulation system according to claim 1, in which the hydrophobic liquid compound is introduced into the insulating system, and the structured surface of the insulator processed liquid hydrophobic compound.

16. Electrical insulation system according to claim 1, in which the liquid hydrophob the second connection introduced in the insulating system and the structured surface is covered with emergent monolayer comprising at least one amphiphilic compound.

17. Electrical insulation system according to claim 3, in which self-organizing monolayer created from solution or gas phase.

18. Insulating system 17, in which self-organizing monolayer is a self-organizing monolayer silane-based, derived from allyltrichlorosilane.

19. A method of manufacturing a surface modified electrical insulation system comprising the following stages:
(i) a composition of the hardened or cured synthetic polymer containing at least one filler;
(ii) processing the surface of the insulating system for forming a structured surface with its micro - and nano-dimensional characteristics; and
(iii) coating the specified structured surface of a liquid hydrophobic compound; or a self-organizing monolayer (SAM)consisting of at least one amphiphilic compound; or coating a given surface emergent monolayer (SAM)consisting of at least one amphiphilic compound in combination with a liquid hydrophobic compound.

20. The method according to claim 19 additionally comprising the stage of:
create the configuration surface is Resto modified electrical insulation system for use in transmission and distribution of electricity.

21. Electric products containing surface modified electrical insulation system that contains:
the composition is hardened or cured synthetic polymer, which contains a synthetic polymer comprising at least one electrically insulating thermoplastic polymer and thermosetting insulating polymer, and at least one filler comprising at least one inorganic oxide, an inorganic hydroxide and inorganic Metagalaxy and the quantity of at least one filler present in the insulating system is 60 wt.% up to 80 wt.% with respect to the total weight of the electrical system; and
the surface, which is formed as a structured surface with micro - and nano-dimensional features, covered with a liquid hydrophobic compound.

22. Electrical insulation system according to claim 1, in which the specified liquid hydrophobic compound is at least one cyclic organopolysiloxane and/or oligomeric organopolysiloxane low molecular weight.

23. Electrical insulation system according to claim 4, in which the specified liquid hydrophobic compound, covering the self-organizing monolayer represents at least one cyclic organic is polisiloxana and/or oligomeric organopolysiloxane low molecular weight.

24. Electrical insulation system according to claim 5, in which the synthetic polymer is a complex polyester or thermoset polymer.

25. Electrical insulation system according to paragraph 24, in which the synthetic polymer is a poly(methyl-methacrylate), or poly(alkylacrylate), or polyurethane, or epoxy resin composition.

26. Electrical insulation system according to claim 5, in which the filler is selected from the group containing silicon dioxide, quartz, known silicates, aluminum oxide, aluminum trihydrate and titanium oxide.

27. Electrical insulation system according to claim 7, in which the filler has a minimum content of SiO2about 96 to 98 wt.%.

28. Electrical insulation system according to claim 1, in which the filler has an average particle size ranging from 10 μm to 100 μm, or a selected combination of particles with an average size.

29. Electrical insulation system according to claim 1, in which the hydrophobic liquid compound is introduced in the electrical insulation system in an amount of about 1 wt.% calculated on the total weight of the insulating system.

30. Insulating system 17, in which self-organizing monolayer is octadecyltrichlorosilane.

31. The method according to claim 19, in which the surface treatment includes:
sandblasting the surface of the insulation until then, until it is formed, essentially, su is its micro - and nano-dimensional features.



 

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1 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention concerns low-viscosity siloxane compositions which can be solidified at room temperature and form elastomer materials applicable as dielectrics and insulators. Invention claims low-viscosity siloxane composition including, weight parts: polyorganosiloxanediol - polydimethylsiloxanediol or polydimethyl(methylphenyl) siloxanediol or their mix at the molar weight ratio of (2÷1):1, 15÷100 thousand - 100, partial tetraethoxysilane hydrolysis product - 4.0÷7.2, amonisilane selected out of group including γ-aminopropyltriethoxysilane or its mix with (3-aminoisopropyltriethoxysilane or diethylamonipropyltetraethoxysilane - 0.5÷1.0. Composition can include fine-dispersed filler quartz, silicon dioxide or dolomite powder, iron, titanium, aluminium, chrome or zinc oxides or their mixes, boron or aluminium nitrides, or mixes of carbon black with metal oxides, oligodimethylsiloxane.

EFFECT: low-viscosity siloxane composition for obtainment of elastic dielectric material without corrosion effect on non-ferrous metals, with high dielectric properties, enhanced substrate adhesion and reduced toxicity, at room temperature.

8 cl, 2 tbl, 2 ex

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, particularly to insulation materials, namely to silicon rubber material containing mix of poly alkylsiloxane (A) and poly arylsiloxane (B). Said mix comprises 3 to 30 weight parts of arylsiloxane (B) per 100 weight parts of poly alkylsiloxane (A). Invention relates also to the method of producing such material. Proposed material can be used for various applications at low temperatures, one of them pertaining to electric insulation.

EFFECT: reduced viscosity factor at minus 50°C and lower costs.

31 cl

FIELD: chemistry.

SUBSTANCE: insulating materials are radiation-cross linked composition based on hydrogen-containing fluoropolymers with polyallyl ethers of polycarboxylic acids acting as cross linking agents. The radiation-cross linked composition based on fluorocarbon polymer contains a hydrogen-containing fluorocarbon polymer with a cross linking agent which is triallyl isocyanurate, and zinc oxide. The fluorocarbon polymeer is an alternating modified copolymer of tetrafluoroethylene and ethylene of equimolar composition, which is such a mixture of two modified copolymers of tetrafluoroethylene and ethylene with different melt flow indices, where the first copolymer of tetrafluoroethylene and ethylene has melt flow index of 60-90 g/10 min in a prepared mixture with CuI2 and with content of the latter between 0.1 and 1.0 wt %, and the other copolymer of tetrafluoroethylene and ethylene is part of the composition with melt flow index of 20-35 g/10 min.

EFFECT: composition has high manufacturability during extrusion and provides high mechanical strength, hardness, wear resistance of the insulation material made from the composition.

FIELD: electricity.

SUBSTANCE: disconnecting switch for interruption of current circuit under voltage which is at least 100 kV relative to the ground includes two groups (14, 15) of elongated bar-shaped support insulators (16) provided with possibility of being installed on the ground and supporting each of ends (19, 20) of wire at high altitude above the ground. Blade (21) of disconnecting switch is connected to one or both of the above wire ends and has the possibility of being moved for connection and disconnection of those ends. Support insulator is made from insulating water-proof composite material on the basis of rubber, containing rubber introduced to fire-resistant filler which is resistant to corona discharge. Disconnecting switch and support insulator can be used in converter station of transfer system of high voltage on direct current.

EFFECT: decreasing the height of support insulators and due to this the height of disconnecting switch.

19 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: surface modified electric insulation system used for electric insulation of an external plant, which makes it possible for garbage and contaminants deposited on the surface to be removed by rain, i.e. self-cleaned, has a superhydrophobic surface containing a composition of a hardened or a cured synthetic polymer, which contains at least one filler and other additives, if required, in which at least one filler is selected from the group containing inorganic oxides, inorganic hydroxides and inorganic metahydroxides, and the surface of the electric insulation system represents a structured surface with its micro- and nano-size characteristics, besides, the specified surface is coated with a liquid hydrophobic compound; a method is also described how to manufacture an electric insulation system.

EFFECT: production of highly resistant and durable electric insulation.

31 cl

FIELD: chemistry.

SUBSTANCE: invention relates to insulation materials used in the cable industry, which are radiation cross-linked fluoropolymer compositions based on an ethylene-tetrafluoroethylene copolymer. The method involves adding a cross-linking agent - trialyl isocyanurate - to a polymer base which contains a granular ethylene-tetrafluoroethylene copolymer (brand - Tefzel). Said agent is added in form of its 20% concentrate which is obtained by mixing molten trialyl isocyanurate with granules of the ethylene-tetrafluoroethylene copolymer (Tefzel), wherein the concentrate is added to the polymer base in ratio of 1 part concentrate to 4-7 parts granules of the polymer base.

EFFECT: high uniformity of distribution of the cross-linking agent in the composition without formation of gel-like inclusions.

2 cl, 2 tbl

FIELD: electricity.

SUBSTANCE: organic-silicon electric-insulating water-proof composition for high-voltage insulators as silicone low-molecular rubber contains rubber of SKTN grade, as low-molecular organic-silicon fluid - organic-silicon fluid of 119-215 grade, as hardener - methyl triacetoxysilan. Per each 100.0 weight parts of rubber this composition contains low-molecular organic-silicon fluid (1.25-2.5) weight parts, aluminium hydrate (5-15.0) weight parts, acetylene black (0.5-2.5) weight parts and hardener (2.5-6.5) weight parts.

EFFECT: improving reliability and increasing service life of cured in coating of electric-insulating construction based on water-proof electric-insulating composition by determining optimum compound and ratio of water-proof composition components.

3 cl, 4 tbl

FIELD: electricity.

SUBSTANCE: hydrophobic organosilicic compound for electric insulating structures is made on the basis of organosilicic compositions of cold hardening. The compound contains silicon low-molecular rubber, a filler, and also a hardener or a catalyst. The compound in vulcanised condition is characterised by the value of the edge angle of wetting from 60° to 179°, tracking erosion resistance at duration of tests making at least 500 hours at working voltages of 6-750 kV, and also with arc resistance characterised with arc current value of at least 100 mA with duration of effect of at least 600 s.

EFFECT: increased reliability and higher service life of a hydrophobic electric insulating coating on the basis of a compound, which is provided by composition and ratio of compound components and specified operating properties of a coating in vulcanised condition.

5 cl, 14 dwg

Insulation material // 2573027

FIELD: chemistry.

SUBSTANCE: invention relates to elastic insulation material based on caoutchouc mixture with resistance to impact of high temperatures. Insulation material for application at temperatures higher than 130°C, which is easily applied on complex components, requiring insulation, also fills internal slots, is insulation material, in which at least part of caoutchouc mixture is not cross-linked and can be plastically deformed, where Mooney viscosity ML(1+4) of mixture at 23°C, determined in accordance with part 3 of DIN 53523 standard, constitutes from 5 to 20 Mooney units. caoutchouc mixture possesses porous structure and contains from 2 to 100 wt.p. of microspheres per 100 wt.p. of caoutchouc for formation of porous structure.

EFFECT: improvement of material properties.

8 cl, 1 tbl, 1 ex

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